EP0969578A1 - Spiralförmiges passelement zur Haltung einer überzogener Leiter und Verfahren zu seiner Herstellung - Google Patents

Spiralförmiges passelement zur Haltung einer überzogener Leiter und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0969578A1
EP0969578A1 EP99304122A EP99304122A EP0969578A1 EP 0969578 A1 EP0969578 A1 EP 0969578A1 EP 99304122 A EP99304122 A EP 99304122A EP 99304122 A EP99304122 A EP 99304122A EP 0969578 A1 EP0969578 A1 EP 0969578A1
Authority
EP
European Patent Office
Prior art keywords
helical
metal wire
wire
component
covered conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99304122A
Other languages
English (en)
French (fr)
Inventor
Trevor Swain
Brian James Holloway
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Preformed Line Products Great Britain Ltd
Original Assignee
Preformed Line Products Great Britain Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Preformed Line Products Great Britain Ltd filed Critical Preformed Line Products Great Britain Ltd
Publication of EP0969578A1 publication Critical patent/EP0969578A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/05—Suspension arrangements or devices for electric cables or lines
    • H02G7/053—Suspension clamps and clips for electric overhead lines not suspended to a supporting wire

Definitions

  • the present invention relates to a helical fitting for securing covered conductors to insulators, and a method of production thereof.
  • each covered conductor normally rests in a locating groove on an insulator.
  • a helical fitting is commonly used to secure the covered conductor to the insulator.
  • a typical situation is illustrated in Figure 1.
  • a cable 1 is supported on an insulator 2 and held in place by helical fitting 3 comprising two components 4, 5.
  • Each component comprises a length of wire factory formed in the shape of an arcuate portion having two extending helical portions, such that the arcuate portion locates around the neck of the insulator and the helical portions are wrapped around and grip the covered conductor.
  • the wires are currently produced in various metals and sizes to suit each specific application, ie aluminium covered steel, with a typical diameter of 2.9mm.
  • helical fittings comprise subsetted wires.
  • several wires may be supplied bonded together to form one component, such that they can be readily applied to the covered conductor with little extra effort than would be required to fit a single wire fitting.
  • helical fittings have been produced using a length of PVC with a co-extruded semi-conductive layer, which is formed into the shape described above.
  • the semi-conductive layer on the helical fitting removes the need to apply semi-conductive tape to the covered conductor.
  • this method of extruding and forming the helical fitting is only suitable for producing a helical fitting with a semi-conductive layer on a PVC core, and such these fittings have been found to have less inherent strength than the traditional metal kind.
  • One aspect of the present invention provides a component for securing a covered conductor to an insulator, comprising a length of metal wire having at least one helical portion, the wire being coated with a semi-conductive coating material.
  • the metal wire is in the shape of an arcuate portion having two extending helical legs, although in some applications only one helical leg will be required.
  • the metal wire is of a sufficient diameter and form to allow single wire components to provide the required holding strength.
  • the diameter of the core is between 3.6mm and 3.7mm, preferably 3.66mm diameter.
  • one helical leg of the component may extend further than the other helical leg, such that the longer helical leg may be connected to an arc protection device.
  • the invention also provides a helical fitting comprising two components as described above.
  • Another aspect of the invention provides a method of manufacturing a helical fitting for securing covered conductors to insulators, wherein a metal wire is formed into a required shape, and a semi-conductive coating material is subsequently applied to the wire.
  • the shape is that of an arcuate portion having one or two extending helical legs.
  • the metal wire used to make the helical fitting is preferably made of stainless steel, although other metals may be used. It may be shaped using dies in a cold forming process.
  • the semi-conductive coating may be applied by dipping, for example using a fluidised bed coating process.
  • the wire is completely covered with the semi-conductive material.
  • the metal wire is pre-heated, preferably at a temperature of between 335°C and 370°C.
  • the material used for the coating is Vestosint 1111 Black 9.7639 (Polyamide 12 Powder with Carbon Black) and the preferred thickness is between 250 microns and 550 microns, more preferably between 450 and 550 microns.
  • each helical fitting component 10 comprises a length of metal wire 20, coated with a semi-conductive coating.
  • Each component is in the shape of an arcuate portion 21 having two extending helical legs 22, 23.
  • Figure 3 shows how the metal wire forms the core 31 of the component and is coated with the semi-conductive coating 32.
  • the helical fitting is applied to a covered conductor I (figure 1) which locates around the neck of the insulator, in a locating groove (not shown).
  • the legs 22, 23 are then wrapped around the covered conductor, such that the two legs effectively form a double helix with the covered conductor 1 running along the axis.
  • the legs therefore grip the covered conductor, and the helical fitting secures the covered conductor to the insulator. This application is repeated for the second element along the covered conductor on the opposite side of the insulator.
  • the semi-conductive layer 32 When the helical fitting is in position, the semi-conductive layer 32 performs the function of reducing the possibility of conductor arcing by reducing voltage stresses along the length of the conductor adjacent to the insulator and thus diminishes the possibility of the occurrence of RIV as detailed in the Post Office memorandum A231 (b) (issued under Engineering Recommendations PO.2, Reference - Electricity Supply Industry Standard 43-15).
  • step 40 the bare wire 20 is subjected to a vapour degreasing process, followed by shot blasting at step 41, to ensure that the surface of the metal is thoroughly clean for the application of the semiconductive coating.
  • step 42 the wire is preheated in a gas oven to a temperature of 335-370"C, following which it is dipped at step 43 in a fluidised (ie: granular), bed of polyamide 12 powder with carbon black.
  • the component is allowed to cool at step 44 and inspected at step 45.
  • a decision is made at step 46 as to whether the coating is of acceptable quality. If yes, at step 47 a hanging hook is removed and any mark made by the hook touched up and the part is packed and despatched at step 48. If no, the coating is stripped off the wire at step 49 and steps 41 to 46 are repeated.
  • the layer 32 covers the ends of the elements 20 whereby none of the metal is left exposed, in contrast to an extrusion process in which the ends of the coated material are uncovered.

Landscapes

  • Insulated Conductors (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP99304122A 1998-05-29 1999-05-27 Spiralförmiges passelement zur Haltung einer überzogener Leiter und Verfahren zu seiner Herstellung Withdrawn EP0969578A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9811642A GB2338118B (en) 1998-05-29 1998-05-29 Helical fitting components for the securing of covered conductor and method of production thereof
GB9811642 1998-05-29

Publications (1)

Publication Number Publication Date
EP0969578A1 true EP0969578A1 (de) 2000-01-05

Family

ID=10832961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304122A Withdrawn EP0969578A1 (de) 1998-05-29 1999-05-27 Spiralförmiges passelement zur Haltung einer überzogener Leiter und Verfahren zu seiner Herstellung

Country Status (2)

Country Link
EP (1) EP0969578A1 (de)
GB (1) GB2338118B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0404836D0 (en) * 2004-03-04 2004-04-07 Griffin Denis Cable holding device
RU2743416C2 (ru) * 2017-10-13 2021-02-18 Общество С Ограниченной Ответственностью "Мзва" (Ооо "Мзва") Спиральная вязка

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842467A (en) * 1972-06-14 1974-10-22 M Konishi Helical elements for a line conductor
FR2427716A1 (fr) * 1978-06-02 1979-12-28 Emerson Electric Co Dispositif de fixation de fil electrique preforme en helice
DE4333799C1 (de) * 1993-09-10 1995-01-05 Deutsche Forsch Luft Raumfahrt Befestigungselement und Verfahren zur Herstellung desselben
WO1996014176A1 (en) * 1994-11-04 1996-05-17 The Morgan Crucible Company Plc Methods and apparatus for manufacturing helical products

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015073A (en) * 1976-01-02 1977-03-29 A. B. Chance Company Universal line tie and method of making same
US4733021A (en) * 1986-12-31 1988-03-22 Helical Line Products Company Line tie assembly with captured cushioning pad

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842467A (en) * 1972-06-14 1974-10-22 M Konishi Helical elements for a line conductor
FR2427716A1 (fr) * 1978-06-02 1979-12-28 Emerson Electric Co Dispositif de fixation de fil electrique preforme en helice
DE4333799C1 (de) * 1993-09-10 1995-01-05 Deutsche Forsch Luft Raumfahrt Befestigungselement und Verfahren zur Herstellung desselben
WO1996014176A1 (en) * 1994-11-04 1996-05-17 The Morgan Crucible Company Plc Methods and apparatus for manufacturing helical products

Also Published As

Publication number Publication date
GB2338118B (en) 2002-03-20
GB9811642D0 (en) 1998-07-29
GB2338118A (en) 1999-12-08

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